package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        if (RegexUtils.isPhoneInvalid( phone)){
            return Result.fail("手机号格式错误");
        }
        String code = RandomUtil.randomNumbers(6);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.debug("发送验证码成功，验证码：{}",code);// 测试用
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        if (RegexUtils.isPhoneInvalid( loginForm.getPhone())){
            return Result.fail("手机号格式错误");
        }
        if (RegexUtils.isCodeInvalid( loginForm.getCode())){
            return Result.fail("验证码格式错误");
        }
        String phone=loginForm.getPhone();
        String Cashecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code =loginForm.getCode();
        if (Cashecode == null || !Cashecode.equals(code)){
            return Result.fail("验证码错误");
        }
        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(loginForm.getPhone());
        }
        //生成token作为redis的key，防止重复
        String token = UUID.randomUUID(false).toString();
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userDtoMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .ignoreNullValue()
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        String tokenKey=LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userDtoMap);
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);// 设置有效期
        return Result.ok(token);
    }

    @Override
    public Result me() {

        UserDTO user = UserHolder.getUser();
        return Result.ok(user);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        String keySuffix = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + ":" + keySuffix;
        int offset = LocalDateTime.now().getDayOfMonth() - 1;
        stringRedisTemplate.opsForValue().setBit(key,offset,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        String keySuffix = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + ":" + keySuffix;
        int offset = LocalDateTime.now().getDayOfMonth() - 1;
        int now=offset+1;
        List<Long> result = stringRedisTemplate.opsForValue()
                .bitField(key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(now))
                        .valueAt(0));
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null|| num == 0) {
            return Result.ok(0);
        }
        int cnt=0;
        while ((num & 1) != 0) {
            cnt++;
            num >>>= 1;
        }
        return Result.ok(cnt);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
